please help me to fill this out im stuck and need to understand

Beginning inventory purchases, and sales data for tennis rackets are as follows: April 3 Intory 21 units @ $15 11 Purchase 12 units $17 14 Sale 19 units 21 Purchase 12 units $16 25 Sale 17 units Complete the inventory cost card assuming the business maintains a perpetual wentory system and determine the cost of goods sold and ending Inventory using to Cast of Purchases Goods Sold Inventory Date Qty. Unit Cost Total Cost Unit Cast Total Cost Qty. timil Cost Total Cost April 21 $ 15 12 17 2014 33 Oty 19 25 Total Cost of goods sold $ Ending inventory value